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You have to verify the in the motherboard book if the brand name or vendor of your merory stick is compatible with your computer's motherboard, there all written : Kingston, Samsung, micron etc... Check all details if meets your motherboard's model requirements and make the change if necessary.

If all details are correct, check in your motherboard's manual if there is a special configuration to respect (in withc bank you should place your memory stick and witch order etc)

check your hardware settings it could be the codes for the hardware that cannot recognize of your systems. it could be change with the wrong specs. if you cannor configure it out. you better set the bios configuration to default setting and try to repair the system using your operating system cd installer. thanks